32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



pore preacetabular ; cirrus pouch and cirrus absent; seminal vesicle 

 convoluted, free in parenchyma. Testes in posterior third of body, 

 placed slightly obliquely to long axis of body. Ovary median in po- 

 sition, situated about midway between anterior border of testes and 

 acetabulum; seminal receptacle voluminous, postovarial. Vitellaria 

 extracecal and consisting of relatively large groups of follicles ex- 

 tending from level of seminal receptacle to level of genital pore or 

 slightly beyond. Uterus greatly convoluted, extending laterally over 

 ceca and anteriorly beyond acetabulum. Parasites of bile ducts of 

 mammals. 



Type species. — PseudamphistoTnuin truncatwm (Rudolphi, 1819) 

 Luhe, 1908. 



PSEUDAMPHISTOMUM TKUNCATUM (Rudolphi. 1819) Luhe. 1908 



Plate 8, Figure 35 



Synonyvis. — Amphistoma truncatum Rudolphi, 1819, p. 91; Bis- 

 ioma coivm Creplin, 1825, pp. 50-53; Distomum lanceolafuni Mehlis 

 of Diesing, 1858, p. 332 ; Distoma cannpanulatmn Ercolani, 1875, pp. 

 432-439; Metorchis truncatus (Rudolphi, 1819) Looss, 1899, p. 565. 



Description. — Pseudainpliistomwm: Body conical, 2 mm long, an- 

 terior end pointed, posterior end truncate and suckerlike. Cuticle 

 thickly and regularly beset wdth fine spines. Oral sucker 132)ii to 

 137ja in diameter ; acetabulum about same size as oral sucker and sit- 

 uated slightly preequatorial. Excretory pore situated in the de- 

 pression of the posterior suckerlike structure. Pharynx 91/x long; 

 esophagus very short ; intestinal ceca slightly sinuous and extending 

 to posterior end of body. Genital aperture preacetabular; seminal 

 vesicle convoluted and free in parenchyma. Testes globular or 

 slightly ellii^tical, 172/* to 376/x long, situated in the posterior third 

 of the body, one slightly in front of the other. Ovary globular, 

 situated about midway between the anterior border of the anterior 

 testis and the acetabulum, usually obscured by the uterine coils; 

 seminal receptacle voluminous, postovarial. Vitellaria situated lat- 

 erally, chiefly in the middle third of body, each composed of 10 to 12 

 groups of follicles. Uterus greatly convoluted, occupying the greater 

 part of the body width between testes and acetabulum, and extend- 

 ing somewhat in front of acetabulum. Eggs 29ju, long by 11/x wide. 



Hosts. — Phoca vitulina, P. groenJandica, P. hispid a = Halichoerus 

 foetidus, Halichoerus gryjyus, Gido horeaUs.) Felis domestica, Canis 

 faTniliaris, C. vulpes. 



Location. — Bile ducts. 



Distribution. — Europe (Germany, Holland, Italy, France). 



